Daniel L Riddle1, George Moxley, Levent Dumenci. 1. Department of Physical Therapy and Orthopaedic Surgery, Basement, West Hospital, Room B-100, Virginia Commonwealth University, Richmond, VA 23298-0224, USA. dlriddle@vcu.edu
Abstract
OBJECTIVES: Recently published research suggests that statins may have beneficial structural effects in persons with knee osteoarthritis (OA). The potential effects of statins on patient-reported knee pain and function have not been examined. We studied a large prospective community-based cohort of persons with knee OA to determine if statin usage was associated with changes in knee structure, pain and function trajectories. METHODS: Data were obtained from the Osteoarthritis Initiative using a subset of 2207 persons with radiographically suspected or confirmed knee OA. The changes in Western Ontario and McMaster Universities Arthritis Index (WOMAC) Pain and Physical Function scores, pain intensity and Kellgren-Lawrence radiographic grade over 4 years were examined. Data from persons were coded based on whether they were incident users of statins over the 4-year period. Outcome trajectories and probability of statin use were examined over the 4-year study period using parallel processing growth curve modelling. The analysis adjusted for potential confounders and determined if statin use predicted outcome trajectories. RESULTS: Statin users accounted for 6.7% of the sample in year 1 and 16.4% in year 4. Statin use was not associated with improvements in knee pain, function or structural progression trajectories. The only significant finding indicated that increased duration of statin use was associated with worsening in WOMAC Physical Function scores over the study period (β=0.161, p=0.005). CONCLUSIONS: Statin use was not associated with improvements in knee pain, function or structural progression over the 4-year study period.
OBJECTIVES: Recently published research suggests that statins may have beneficial structural effects in persons with knee osteoarthritis (OA). The potential effects of statins on patient-reported knee pain and function have not been examined. We studied a large prospective community-based cohort of persons with knee OA to determine if statin usage was associated with changes in knee structure, pain and function trajectories. METHODS: Data were obtained from the Osteoarthritis Initiative using a subset of 2207 persons with radiographically suspected or confirmed knee OA. The changes in Western Ontario and McMaster Universities Arthritis Index (WOMAC) Pain and Physical Function scores, pain intensity and Kellgren-Lawrence radiographic grade over 4 years were examined. Data from persons were coded based on whether they were incident users of statins over the 4-year period. Outcome trajectories and probability of statin use were examined over the 4-year study period using parallel processing growth curve modelling. The analysis adjusted for potential confounders and determined if statin use predicted outcome trajectories. RESULTS: Statin users accounted for 6.7% of the sample in year 1 and 16.4% in year 4. Statin use was not associated with improvements in knee pain, function or structural progression trajectories. The only significant finding indicated that increased duration of statin use was associated with worsening in WOMAC Physical Function scores over the study period (β=0.161, p=0.005). CONCLUSIONS: Statin use was not associated with improvements in knee pain, function or structural progression over the 4-year study period.
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